Observing and Modeling the Wear Process of Heterogeneous Interface
Xin Tang1, Aisheng Song1, Haijun Wu1,2
1State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China.
Nano Letters
|May 30, 2024
Summary
A new nanowear test method reveals wear mechanisms in composites. Increased interfacial friction causes particle fracture or pullout, offering insights for material design and nanofabrication.
Area of Science:
- Materials Science
- Tribology
- Nanotechnology
Background:
- Controlling wear in heterogeneous interfaces is vital for material performance, particularly in particle-reinforced composites and chemical mechanical polishing.
- Observing wear at buried interfaces presents significant challenges due to limited accessibility.
Purpose of the Study:
- To develop and demonstrate a novel nanowear testing method for direct observation of interface wear.
- To investigate wear mechanisms in aluminum/silicon carbide (Al/SiC) composites.
- To establish a theoretical model explaining wear behavior based on interfacial properties.
Main Methods:
- Focused ion beam (FIB) cutting to expose subsurface interfaces.
- Atomic force microscopy (AFM) for controlled nanoscale friction testing.
- Scanning electron microscopy (SEM) for detailed characterization of interface damage.
Main Results:
- Successfully observed three distinct wear modes in Al/SiC composites: matrix wear, particle fracture, and particle pullout.
- Developed a theoretical model linking interfacial friction to wear outcomes.
- Demonstrated that particle edge and tip angles influence fracture versus pullout under increased friction.
Conclusions:
- The proposed nanowear test method enables direct observation and analysis of interface wear.
- Interfacial friction is a critical factor governing wear mechanisms in composites.
- The findings provide a foundation for wear control strategies in advanced materials and nanofabrication processes.
